I'm black.
Now tell me what "acting white" means.
A black person whose mannerisms, cadence and attitude, which can be immediately identified with a CAC. see @Nigerian
It has NOTHING to do with articulation. Alot of these "acting white" negroes will say, "no, i just speak proper and i'm articulate and you accuse me of acting white". Cornell West, Barack Obama etc they are articulate but they don't get the "acting white" label and rightfully so.
If you want an example of acting white see @Nigerian, perfect example. I mean i can't blame them if they have been raised in CACville but that is what Black people mean when "acting white".
Do you "act white"?